The Nut,tube Coupling, cataloged under National Stock Number 4730-01-201-2255, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Naval Ship Systems Command. Government technical data includes 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-201-2255 |
| Primary Part Number | 845-2445071ITEM34 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — No Item Name Available |
| Manufacturer | Naval Ship Systems Command |
| Status | ACTIVE |
| Seat Angle | 43.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM |
| Material | COPPER ALLOY OVERALL |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Thread Series | UNF |
| Smallest Inside Diameter | 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Nut Style | TUBE COUPLING |
| Nut Height | 0.590 INCHES NOMINAL IN |
| Fabrication Method | FORGED |
| Nominal Tube Outside Diameter | 0.250 INCHES IN |
| Width Across Flats | 0.625 INCHES NOMINAL IN |
| Thread Class | 2B |
| Length to Shoulder | 0.440 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZY |
| Nominal Thread Size | 0.438 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Thread Quantity Per Inch | 20 |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 845-2445071ITEM34 | Naval Ship Systems Command (USA) |
| NS4-4 | Kolpak Industries Inc Mc Call Refrigerator Div (USA) |
| 2620-219X1 PC146 | Electric Boat Corporation Div General Dynamics Electric Boat (USA) |
| 845-1889863 PC146 | Naval Ship Systems Command (USA) |
NSN 4730-01-201-2255 is a Nut,tube Coupling, manufactured by Naval Ship Systems Command, classified under FSC 4730 (No Item Name Available). Status: active.
NSN 4730-01-201-2255 has 4 cross-referenced part numbers: 845-2445071ITEM34 (Naval Ship Systems Command), NS4-4 (Kolpak Industries Inc Mc Call Refrigerator Div), 2620-219X1 PC146 (Electric Boat Corporation Div General Dynamics Electric Boat), 845-1889863 PC146 (Naval Ship Systems Command).
There is 1 known substitute for 4730-01-201-2255: 4730-00-189-2737. Verify interchangeability with system specifications before substitution.
Key specifications for 845-2445071ITEM34: Seat Angle: 43.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM; Material: COPPER ALLOY OVERALL; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS; Thread Series: UNF. 16 total characteristics are documented in the Federal Logistics Information System.